| Gaithersburg to Harrison (Wisconsin) | 669.44 mi (1,077.36 km) |
| Gaithersburg to Harrisonburg (Virginia) | 101.61 mi (163.53 km) |
| Gaithersburg to Hartford (Connecticut) | 299.56 mi (482.09 km) |
| Gaithersburg to Hartford (Wisconsin) | 647.60 mi (1,042.21 km) |
| Gaithersburg to Hartselle (Alabama) | 627.89 mi (1,010.49 km) |
| Gaithersburg to Hartsville (Tennessee) | 523.69 mi (842.79 km) |
| Gaithersburg to Harvey (Illinois) | 575.02 mi (925.41 km) |
| Gaithersburg to Harvey (Louisiana) | 969.64 mi (1,560.48 km) |
| Gaithersburg to Hasbrouck Heights (New Jersey) | 204.54 mi (329.18 km) |
| Gaithersburg to Haslett (Michigan) | 450.58 mi (725.14 km) |
| Gaithersburg to Hastings (Minnesota) | 890.12 mi (1,432.51 km) |
| Gaithersburg to Hastings (Nebraska) | 1,124.87 mi (1,810.30 km) |
| Gaithersburg to Hattiesburg (Mississippi) | 869.97 mi (1,400.08 km) |
| Gaithersburg to Hauppauge (New York) | 241.79 mi (389.12 km) |
| Gaithersburg to Havelock (North Carolina) | 292.56 mi (470.83 km) |
